Virtualization of Local Computer Bus Architectures Over the Internet

Abstract

We propose a companion solution to iSCSI that is more suited for virtualization of local computer bus architectures, such as PCI/PCI-X and PCI Express. We explore the architecture of a possible virtualization protocol. The solution would allow extension of the host computer bus via an IP network based on 10Gbps Ethernet. This solution would allow adapter cards to be located remote from host systems via the Internet, yet appear as a local bus resource. We present Quality of Service (QOS) goals for PCI Express virtualization and expansion via IP. Critical QOS characteristics such as data transfer rates and latency are discussed. PCI Express transaction types are reviewed to assess whether IP over 10 Gbps Ethernet is suitable as a transport. A general protocol architecture as presently envisioned is described. We introduce a class system for performance categorization. We identify the areas that require further research and investigation. System overhead, latency, and timeouts must be addressed. Methods for configuring and optimizing the data transfer path must be developed.